But They Should Because there are 6 classes and If you want class diversity on your team the only way to do that is to add 6. They could at least make it if you become level 60 or maybe even Uncollected you can have 6 characters on your team
It's designed that way so you have to pick and choose whos on your team, by allowing all 6 classes into a quest it would give you too much of an advantage, especially with synergies to explore content. There are certain "trinity" teams that make exploration and completion easy enough..the game isn't supposed to be a cakewalk
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Doom, Human Torch, Quake, Nick Fury, Aegon can tackle literally anything.
Fantastic Four with she hulk is insane.
Black Order, with Thanos.